Drying apparatus for the drying of alimentary paste



J1me 19, 1928. 1,674,326

G. GARBUIO DRYING APPARATUS FOR DRYING OF ALIMENTMH PASTE Filed April 26, 1926 (sheets-she t 1 jive/1m. Gz'q se o oe Garbuc'o.

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June 19, 1928.

G. GARBU|O DRYING APPARRTUS FOR THE DRYING 0F ALIMENTARY PAS TE Filed A t-i1 26, 1926' 4 Sheets-Sheet 3 ..o w 3 .m G

dfttofnet June 19, 1928. 1: i v

G. GARBUIO' I mums APPARATUS FOR THE DRYING 0F ALIIIENTARY PASTE Filed-April 26, 192 i Sheets-Sheet 4 Patented June 19, 1928.

UNITED STATES 1,674,326 PATENT OFFICE.

GIUSEPPE GARB'UIO, OF TREVISO, ITALY.

DRYING APP ARATUSFOR THE DRYING OF ALIMEN'I'ARY PASTE.

Application filed April 26, 1926, Serial No. 104,818, and in Italy November 7, 1925.

This invention relates to improved drying apparatus such as is employed for the drying of alimentary paste, macaroni and similar pastes forexample.

One object of the invention is to provide an apparatus in which the drying is carprovide a drier in ntroduction of exapparatus exemplified in the annexed drawing, in which 1 Figure 1 is a front elevation. Figures 2 and 3 are vertical sections taken in planes at right angles to oneanother.

Figures 4 and 5 show respectively, on a larger scale, the means for attaching and varying the blades of the ventilators, and a regulator arrangement for varying the quantity of air admitted to a drier fittedwith non-variable flap-valves.

Figs. (3 and 7 are a plan view and bottom plan view respectively of the blades of a ventilator, drawn on a larger scale.

Figs. 8

a front elevation respectively of the Ventilator in closed position. v

Fig. 10 is a front elevation of the ventilator in open position.

' he drier comprises a central shaft 1 upon which are mounted the fans or ventilators 2,

3, 4. and 5, the shaft being driven by a suitable transmission and pulley 6 keyed to the end of the shaft; According to one con..-

struction, the ventilators or fans 2 and 5 mounted near to respective ends of the shaft 1 comprise adjustable blades adapted for having their pitch varied under control of suitable mechanism. For example, such mechanism may comprise rods 7 and 8 connected with a ring 9 which, in turn, is connected by a rod 10 having itsfree end connected with a ring 11. The latter is displaceable along the shaft by means of the control lever 12, Figures 2 and 3. The inter- These and other objects are attained by and 9 are a perspective view andmediate fans 3 and 4 are of greater diameter than the fans 2 and 5, and the air entry is. of constant cross sectional area.

According to the alternative construction and arrangement, the air entry. is variable by means of valves 13 and 14, which regulate the passage of the air as seen in Figure 5.

3 In both cases, the fan 2 sucks air from the chamber wherein the drier is installed, that is to say pure air at constant temperature,

and forces this air into the upper compartment 15. The fan 3 of greater diameter than the fan 2 sucks air from the compartment 15 and distributes it uniformly in all directions for traversing the mass of paste placed in the central compartment 16. The fan 4 withdraws the air that has passed over the paste and has become humid, and delivers it to the entry compartment, or to an intermediate space from which ,such air passes into the compartment 15.

It will be seen that a mixing takes place in thecompartment 15 between the fresh air sucked in by the fan 2 and the humid air circulated'by thefa'n 4. Thus, the fan 3 sucks in from the compartment- 15 a mixture, the natureof which can be determined v by suitable adjustments, and delivers such mixture to the; drying compartment.v At the same time, the fan 5 withdraws from the interior and delivers to the exterior a certain proportion of the humid airfand the volume wlthdrawn by this fan will correspond with that introduced by the fan 2.

As shown in Figs. 6, 7, 8, 9 and 10, the four blades 2 or 5 of the ventilator are r0 tatable around the diametral pivots 20, mounted on the sleeve 21, which is rigid with the shaft 1, and each of said blades bears on its lower side the books 22 supporting the ring 9 by means of members 7 and 8. The ring 9 is rigidly connected with the driving rods 10 which pass through the guide collar 24, which is fixed to the shaft 1, and are attached to the driving collar 11 of the blades 2 or 5 by means of the pressure screws 25. The opening of the blades 2 or 5 of the ventilator is regulated by displacing the lever 12, which, as it is connected with the collar 11, constrains the latter-to follow it in its movements.

By operating in the manner described the drying is performed at a temperature which is approximately constant and is not marred by sudden changes. If a hot Wind should spring up, for example, the hot air in the chamber in which the drier is situated does not adversely affect the drying whenv drawn in and delivered by the fan 2. The reason for this is that such air mixes in the chamber 15 with the air already circulating in the interior as aforesaid so'that it becomes dry progressively. Such air after passing into the compartment 17 leaves the paste with its yellowish colour and porous surface. In this way, the paste can remain unaffected by any rise of temperature.

With a drier operating inaccordance with these improvements, it is possible to dry all kinds of. pastes and the operation can take place even in the same period of time whilst conditions of-humidity and of temperature vary in the chamber in which the apparatus issituated. This is achieved by the ability to vary the volume of air introduced into and collected in the apparatus in a unit of time, that is to say the rate of renewal of the air. The energy necessary for the drying of up to 1,500 kilos is about one horse power and from 1,500 to 2,000 kilos it is about two horse power. For a paste formation of small thickness a dryin'g period of 30 hours may be required and for a paste formation of maximum thickness 96 hours may be necessary.

The details of construction, dimensions and so on can obviously be varied to suit particular requirements without departing from the invention as defined by the claims.

.I claim 2- 1. Drying apparatus comprising a series compartment, another at an opening communicating between said entry anddrying compartments, another at the exhaust from said drying compartment, and another between the said return duct and atmosphere forth.

substantially as and for the purpose set 3. Drying apparatus comprising a drying chamber, an air entry chamber communicating with one end of said drying chamber,

an air exit chamber communicating with the opposite end' of said drying. chamber, a return duct communicating between said entry and exit chambers, a fan adapted for charging said entry chamber with atmospheric air and a fan adapted for discharging w from said exit chamber to atmosphere, and fans of greater capacity than those aforesaid disposed respectively at the air entry and air exit of said drying chamber sub stantially as and for the purpose set forth.

4. Drying. apparatus comprising a series of four fans spaced apart along a single shaft, a series of three compartments, the middle one being a drying compartment, and a duct communicating between. the end compartments, the end fans being disposed in apertures in outer end walls of the end compartments and the intermediate fans being disposed in respective end walls of saiddrying compartment substantially as set forth.

5. Drying apparatus comprising a series of four fans spaced apart along a single shaft, the two end fans being similar to one another and. of smaller diameter than the end fans which also are similar to one another, a series of three compartments, the middle one being a drying compartment, and a duct communicating between the end compartments, the end fans being disposed. in apertures in outer end walls of the end compartments and the intermediate fans being disposed in respective endwalls of said drying compartment substantially as set forth. 1

6. Drying apparatus comprising a series the middle one being a drying compartment,

means of communication between said end compartments, and means for adjusting the useful effect of the first and last of said fans, said first fan being disposed for forcing atmospheric air into the first compartment and said last fan being disposed for draw ing air from the last compartment, the other fans being adapted for propellin'g within the apparatus a volume of air greaterthan the volume of air propelled by said first and last fans substantially as set forth.

GIUSEPPE GARBUIO. 

